Can anyone tell me what the best format for music is?. I have a piece in MP3 but it takes ages to load if my site is viewed on a 56 kbps connection.

Midi. If you want your page to be available to everyone, you will find a .mid file. MP3 files are as compressed a format as you can get, so you have to settle for lesser quality.

Here's some examples of MIDI files on my personal site.

Thanks for your help. Ill try and find midi converter